Improvement in portable derricks



.one to the upper and the other to the l the forward axle.

idle-tied' (giclee aan ema.

JAMES-1n. vHAivrMoNn,.or SEDALIA., Missounr.

Letters Patent N 97,911,dated-December 14, 1869.

The Schedule referred to in these Letters Patent and making part of thesame.

To all ivhom 'it may concerns" Be it known thatLJAMEs R.HAmroNmbfSedalla, in the county of Pettis, and State of Missouri,

have invented a new and useful Improvement in Portable Derricks; and Ido hereby declare that the following is afull, clear, and exactdescription thereof,

- which willI enable others skilled in the art to make and use the same,reference being had `to the accompanying drawings, forming part of thisspecification, ,in

which- Figure l is a top viewlffmy improved derrick.

Figure 2 is avertical detail section of the same, taken through .theline x x, figsl. l

Similar Aletters of reference indicate .corresponding parts. l

My invention has forits object-to furnish an improved derrick, simple inconstruction, effective in op? eration, and easily moved from place toplace, designed especially for use in connection with my improved rake,thresher,I loader, and stacker, but equally applicable for other uses;and l It consists in the' construction and combination of various partsof 'the derrick, as hereinafter morefully described.

A'are thewheels oi' the derricktrucl, the axles B oi" which are madehigh, and are slotted longitudinally,

as shown in fig. 2.

are the bottom boards, two of which are used, and which are placed, theone idirectl y above the other, as shown in iig-f2; The rear ends of thebottom 'boards C are secured, the one to the ripper and the `other tothe lower part of the rear axle ',B. 'lhe forward ends of the bottomboards C are secured to bblsters, which are pivoted by a pin orking-bolt, the lower part oi D is the standard of the derrick, the lowerend of which passes down through a hole in the middle part ot`tlie,upper bottom board, andinto the socket formed in o'r attached tothemiddle part of the lower bottom board. i `E isa stand,formed'byattaching an upright or post' to aba'sedi'ame, said uprightbeing made of i such a height as to lit beneath the middle part ofthelower bottom board U. 'The stand Eis designed to i .be placed directlybeneatlrthe npright'or shaft D of the del-rick, to `sustain the downwardpressure of the weight upon said del-rick.

. To the upper end of the shaft D is attached'a cross-arm F, whichinclines slightly dow nward, frozn its'centre toward its ends, as shownin iig. 2.

V' G is the car, to which the hoisting-apparatus is attached. Thehoisting-apparatusis not shown in the drawing, as there is nothing newabout its construction. The car G is provided with one or morefrictionthat by pulling upon the said cord I, the shoulder o catch ofthe car maybe. raised out of the notchor i rollers, to make it moveeasily, and with, guards to keep it in place upon the arm F. The car' Gris so formed as `to bearA only upon its middle part and lower end, 'andhas a shoulder upon its lower side, to fit into notches or recesses uponthe upper side of the crossearm F.

yTo the upper end of the car G, or to the guardarms attached to saidupper end, is attached a cord,

H, which passes over a guidepulley,fh, pivoted to the side of thecross-arm F, near its middle part,

that by pulling downward upon the saidrrope H,-the

oar G may be drawn inward toward the shaft D of the derrick. To theupper end 'of the car G, or 4to one of th guard-arms attached to-saidupper end of the cui,

is attached a cord, I, which extends downward, s

is to be deposited, and the hoisting-apparatus hasl been slackened, theweighted car- K may draw tbe `cross-arm F back into its proper position.

The car Ky may be weighted'more or less, as may be desirable. a

Having thus described my invention,

I claim as new, and desire to secure by Letters Patentr Il. The car Gand ropes H and I, iu combination with the recessed inclined cross-arm Fof the vertical pivoted shaft D, substantially as herein shown anddescribed, and for the purposes .set forth.

The double-inclined plane L, and weighted carl K, in combination withthe cross-arm F of the vertivcal shaft D of .the dei-rick, substantiallyas herein shown and described, and for the purpose set forth.

3. An improved portable derrick, formed by the combination of the truckA B C, stand E, shaft D,` cross-arm F, car, G, ropes H I, rope J,weighted vcar K, and double-inclined plane L, with each other,substantially as herein shown and described, and for the purpose setforth.

s JAMES R. HAMMOND.

Witnesses:

EUGENE S. Gnomi, WM. H. H. HILL.

